Logging or butt chain lead-block.



J. B. GILGHRIST.

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PPPPPPPPPPPPPPPPP 0T. 23, 1912. 1,060,676. Patented May 6, 1913.

by y 1 v i V 1 V I a Attorneys JOHN E. GILCHRIST, OF SOUTH BEND, WASHINGTON.

LOGGING OR BUTT CHAIN LEAD-BLOCK.

Specification of Letters Patent.

Patented May 6,1913.

Application filed October 23, 1912. Serial No. 727,466.

To all whom it may concern Be it known that I, J OI-IN E. GILGHRIST, a citizen of the United States, residing at South Bend, in the county of Pacific and State of Washington, have invented a new and useful Logging or Butt Chain Lead- Block, of which the following is a specification.

This invention relates to improvements in logging or butt chain lead blocks, the primary object of the present invention being the provision of a block having a plurality of rotatable sheaves mounted on a single spindle or shaft and held in proper spaced relation to each other so that the log chain or cable will not of necessity rotate all three of the sheaves at a single time, but be properly guided at all times over and through the block, the guiding portions which constitute the outer sheaves being as before stated, rotat-ably mounted so that when engaged by the chain or cable, the same will rotate therewith and thus reduce the wear upon the chain or cable and also the wear upon the respective guiding sheaves. It is a known fact in blocks used for this purpose, which are of great size and weight, weighing anywhere from one hundred and fifty to three hundred pounds, that it is desirable to produce a sectional sheave, and although heretofore the central sheave has been mounted rotatable with the other sheaves fast upon a spindle, it has been found that the wear upon the outer sheaves, the same being rigid with relation to the central sheave, is objectionable and tends to place a drag upon the chain or cable passing thereover, and in order to obviate this defect, the present block having three independently rotatable and spacedly mounted sheaves has been provided.

With the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed can be made within the scope of what is claimed without departing three sheaves showing the relative position of the sheaves upon the spindle.

Referring to the drawings, the numeral 1 designates the spindle which is preferably made hollow and has made fast upon the same and in spaced relation, the two spacing disks 2 and 3, which are held upon the spindle by means of the set screws 11, as clearly shown in Fig. 2. Mounted rotatably upon the portion of the spindle between the two spacing disks 2 and 3 is the central sheave or pulley 4 which is provided with the concentrically disposed grooves 5 and 6, which form recesses to receive the opposite faces of the two spacing disks 2 and 3, while disposed upon the spindle beyond the respective spacing disks 2 and 3, are the outer and larger sheaves 7 and 8, the sheave 7 being provided with the concentric recess 9 to incase the outer face of the disk 2, while the sheave 8 is provided with the concentric recess 10 to incase the outer face of the spacing disk 3. The respective concentric recesses 5, 6, 9 and 10 are so formed that when the three sheaves are in proper position upon the spindle 1, the sheaves are separated as at a so that each sheave is permitted independent rotation of the other and so that no rigid surface is provided upon which the chain or cable travels during the passage through the block.

The spindle l is provided with the longitudinal lubricant bore 12, which is sealed at the respective ends by means of the screw plugs 13, and leading from this bore are the oil ducts Z), 0 and d, which direct the lubricant to the spindle engaging portion of the respective sheaves.

As clearly shown in Fig. 1, the sheaves 4, 7 and 8 with their spindle 1 are properly disposed between the pivotally mounted hangers l5, and are held in place by means of nuts let placed upon the respective ends of the spindle, the hangers 15 being pivotally connected to the bail 16, all of usual construction.

From the foregoing description, taken in connection with the drawings, it is evident that a butt chain lead or logging block constructed according and embodying the present invention, will have all the advantages of the sectional sheaves now employed and in view of the fact that the outer sheaves 7 and 8 are independently rotatable and not fast as is the usual structure, the disadvantage of having them rigid is overcome and a durable and moreeflicient sheave is the re sult. It is also apparent that with a sheave as herein shown and described, that should any of the respective sheaves become unduly Worn, due to the passage of the chain or cable thereover, the Worn sheave may be removed and replaced with a new one without the necessity of the destruction or loss of the complete block.

What is claimed is:

1. A block, including a hanger, a spindle mounted therein, three independently mounted and rotatable sheaves mounted upon the spindle and constituting a rot-atable sectional cable guide, and means fixedly secured to the spindle and between the sheaves for maintaining the sheaves in spaced relation and for independent rotation.

2. A sheave block, including a hanger, a spindle mounted in the hanger, two spacing disks secured upon the spindle and in spaced relation to each other, an inner sheave rotatably mounted upon the spindle and between the spacing disks, and two outer sheaves, independent of each other mounted upon the spindle one beyond each of the spacing disks and between the adjacent portions of the hanger.

3. A sheave block, having a hanger, a spindle mounted in the hanger, a centrally disposed sheave mounted upon the spindle, the opposite faces thereof being provided with concentrically disposed recessed portions, two circular spacing disks fixed upon the spindle and disposed to have a portion thereof seated within the respective recesses of the sheave, and two outer sheaves rotatably mounted upon the spindle beyond each spacing disk, each of the outer sheaves being provided with a concentrically disposed recess to incase the remaining portion of the spacing disks, the sheaves being held in spaced relation to the central sheave by the spacing disks and all of the sheaves being independent of each other.

In testimony that I claim the foregoing as my own, I have hereto afiiXed my signa-v ture in the presence of two witnesses.

JOHN E. GILCHRIST.

Witnesses:

CHARLES S. CASEY, ARNOLD LEBO.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

